拟除虫菊酯类农药是一类能防治多种害虫的广谱杀虫剂, 主要用于卫生杀虫和农田害虫防治。 利用太赫兹时域光谱技术对室温状态下的三种常用于农田害虫防治的菊酯农药高效氯氰菊酯、 高效氯氟氰菊酯及溴氰菊酯进行了研究, 三种菊酯农药根据其在0.2～2.2 THz的吸收谱可清晰地分辨; 采用线性回归和偏最小二乘回归对溴氰菊酯、 聚乙烯混合物进行定量分析。 偏最小二乘回归取得更好结果, 其中溴氰菊酯含量的检出限达2.0%, 获得的均方差为0.55%, 绝对偏差均小于0.8%。 结果表明THz-TDS技术在农药分子识别及含量检测方面有很大潜力。

Pyrethroids pesticides are broad-spectrum insecticides which were used to control variety of pests, and were mainly used to hygienic insecticides and agricultural pest control. The room-temperature terahertz spectra of b-cypermethrin, l-cyhalothrin and deltamethrin were investigated by terahertz time-domain spectroscopy (THz-TDS) technology. The three pyrethroids pesticides were easily discriminated according to the absorption spectra within 0.2～2.2 THz. We employed SLR and PLS method to perform the quantitative analysis of the mixture of deltamethrin in polyethylene. The PLS method provides better result than SLR method. The detection limit of deltamethrin content in the mixture can be down to 2.0%, and the maximum value of absolute error was 0.8%. The root mean square error was 0.55%. This result proved that the THz-TDS technique is quite potential for pesticide molecular discrimination and content determination.